Picidae generally have a strong bill and in many forms it is modified into a cutting weapon, the end of upper mandible being vertical and chisel-shaped. With this weapon Woodpeckers cut away the bark of trees to look for insects, and make holes in the trunks or branches for nests. Many species by tapping on trees make a noise that may be heard a considerable distance. The point of the tongue is horny and barbed. Almost all Indian Woodpeckers are insectivorous, a large proportion of them feeding mainly and some entirely on ants. All lay glossy white eggs, and all, with the exception of one genus, make holes in trees and lay their eggs in them, the eggs resting on the chips without any other lining to the hole.

Bay Woodpecker  (Blythipicus pyrrhotis) - local resident
Rufous Woodpecker  (Celeus brachyurus) - widespread resident
Greater Flameback  (Chrysocolaptes lucidus) - widespread resident
White-naped Woodpecker  (Chrysocolaptes festivus) - widespread resident
Stripe-breasted Woodpecker  (Dendrocopos atratus) - local resident
Brown-fronted Woodpecker  (Dendrocopos auriceps) - local resident
Grey-capped Woodpecker  (Dendrocopos canicapillus) - local resident
Crimson-breasted Woodpecker  (Dendrocopos cathpharius) - local resident
Darjeeling Woodpecker  (Dendrocopos darjellensis) - local resident
Himalayan Woodpecker  (Dendrocopos himalayensis) - local resident
Rufous-bellied Woodpecker  (Dendrocopos hyperythrus) - local resident
Fulvous-breasted Woodpecker  (Dendrocopos macei) - widespread resident
Yellow-crowned Woodpecker  (Dendrocopos mahrattensis) - widespread resident
Great Spotted Woodpecker  (Dendrocopos major) - local resident
Brown-capped Woodpecker  (Dendrocopos nanus) - widespread resident
Black-rumped Flameback  (Dinopium benghalense) - widespread resident
Common Flameback  (Dinopium javanense) - local resident
Himalayan Flameback  (Dinopium shorii) - local resident
Andaman Woodpecker  (Dryocopus hodgei) - local resident
White-bellied Woodpecker  (Dryocopus javensis) - widespread resident
Pale-headed Woodpecker  (Gecinulus grantia) - local resident
Heart-spotted Woodpecker  (Hemicircus canente) - local resident
Eurasian Wryneck  (Jynx torquilla) - local resident & widespread winter visitor
Great Slaty Woodpecker  (Mulleripicus pulverulentus) - local resident
Speckled Piculet  (Picumnus innominatus) - widespread resident
Grey-faced Woodpecker  (Picus canus) - widespread resident
Lesser Yellownape  (Picus chlorolophus) - widespread resident
Greater Yellownape  (Picus flavinucha) - widespread resident
Scaly-bellied Woodpecker  (Picus squamatus) - local resident
Streak-throated Woodpecker  (Picus xanthopygaeus) - widespread resident
White-browed Piculet  (Sasia ochracea) - local resident

Reference:

Woodpeckers - Picidae - [Fauna of India (Birds) vol iii 1895 - by W. T. Blanford]